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'1). DAVIS-0N. v Front Wa'll of-G-jas Retort Ovens. I No. 240,612.Patented April '26, 1881.

0 Mbzgssks (y 17214912102 UNITED STATES PATENT OFFICE.

DARIUS DAVISON, OF NEW YORK, N. Y.

FRONT WALL OF GAS- RETORT OVENS.

SPECIFICATION forming part of Letters Patent No. 240,672, dated April26, 1881.

Application filed September 17, 1878. v

To all whom it may concern:

Be it known that I, DARIUS DAVISON, of the city and State of New York,have invented new and useful Improvements in the Front Walls ofGas-Retort Ovens; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification.

A very great objection to the ordinary manner of constructing the frontwalls of gas-retorts is that the bolts which are employed for securingthe iron mouth-pieces upon the clay retorts are inclosed in solidbrick-work, which becomes heated to a very high degree by the fire inthe ovens. By such heat the bolts are expanded sufficiently to loosenthe mouthpieces from the retorts, thereby causing a serious leakage ofgas between the two, and are also very rapidly oxidized by the heat, andsoon break off, disabling the retorts for further use, although they areotherwise good.

The object of my invention is to prevent the bolts from becoming heatedsufficiently to produce the defects above mentioned.

To this end the invention consists in the combination, with a retort, amouth-piece, and bolts securing the two together, ofa front Wall,supporting said retort, and constructed with recesses or apertures inits outside, which receive within them or are in close proximity to thesaid bolts, whereby I provide for a slow circulation of comparativelycool air in immediate contact or in close proximity to said bolts, andprevent their becoming too highly heated.

In the accompanying drawings, Figure I is a front view of a bench ofretorts which are set according to my invention. Fig. 2 represents avertical sectionupon the line A, Fig. l; and Fig. 3 represents ahorizontal section upon the line B, Fig. 1.

Similar letters of reference designate corre sponding parts in all thefigures. D designates a number of retorts, the front ends or months onlyof which are shown, and to them are secured ordinary cast-ironmouthpieces by means of bolts F, in the usual way.

E designates the front wall supporting the retorts, the front of whichis represented as about coincident with the ends or months of p torts, Ipreferably construct this wall of three or four or more widths of brick,as the nature of the case may require.

In order to prevent the bolts F from being so highly heated that theirexpansion would loosen the iron month-piece of the retort and produceleakage between the mouth-piece and retort, and also to preserve thebolts and prevent their rapid oxidation, I construct the front wall, E,with recesses or apertures O in close proximity to the bolts F, andwhich are open to the atmosphere, so that a slow circulation ofcomparatively cool air may take place in contact with the bolts, or insuch close proximity thereto that they will be prevented from beingheated to an injurious degree.

By my invention I not only effect a saving of gas by preserving a tightjoint between the mouth of the retort and the iron mouth-piece, but Ipreserve the durability of the bolts and enable the retort so set to beused for a long time without repair.

WhatI claim as my invention, and. desire-M to secure by Letters Patent,is-

The combination, with a retort, a mouthpiece, and bolts securing the twotogether, of

a front wall supporting said retort and constructed with recesses orapertures in its outer side in close proximity to the saidsecuringbolts, substantially as and for the purposes herein set forth.

DARIUS DAVISON.

Witnesses:

Josnrn DAVISON, HENRY '1. BROWN.

